我试图用ref
来测量一个视图,但返回的width
是0,尽管我看到屏幕上显示的视图(它远远不等于0).
我试着遵循这个:https://github.com/facebook/react-native/issues/953,但它就是不起作用...我只想得到视图的实际宽度.
这是我的代码:
var Time = React.createClass({
getInitialState: function() {
return({ progressMaxSize: 0 });
},
componentDidMount: function() {
this.measureProgressBar();
},
measureProgressBar: function() {
this.refs.progressBar.measure(this.setWidthProgressMaxSize);
},
setWidthProgressMaxSize: function(ox, oy, width, height, px, py) {
this.setState({ progressMaxSize: width });
},
render: function() {
return(
<View style={listViewStyle.time} ref="progressBar">
<View style={listViewStyle.progressBar} >
<View style={[listViewStyle.progressMax, { width: this.state.progressMaxSize }]}/>
</View>
</View>
);
}
});
关联的样式:
time: {
position: 'absolute',
bottom: 5,
left: 5,
right: 5,
backgroundColor: '#325436',
flexDirection: 'row',
},
progressBar: {
flex: 1,
backgroundColor: '#0000AA',
},
progressMax: {
position: 'absolute',
top: 0,
left: 0,
backgroundColor: '#000',
height: 30,
},